Sneezing, coughing, and a pasty complexion are all telltale signs that someone is under the weather. But, according to a new research published in Psychological Science, you can detect whether or not someone is sick just by smelling them. Even more, researcher Mats Olsson of Karolinska Institutet in Sweden claims there’s scientific evidence that postulates some diseases have distinct aromas. For instance, it’s been noted that the breath of people with diabetes can smell like acetone or rotten apples. “There may be early, possibly generic, biomarkers for illness in the form of volatile substances coming from the body,” says Olsson.